I’ve had PRs merged many months later. Hopefully that won’t happen too often for participants, but we may all get onto a “rolling schedule”, where you submit PRs, and sometime later while working on a later PR, you get the nice surprise of an earlier PR being merged

ptc: that’s fine. you might say you’re done when you’ve submitted a PR. Or you might wait to see if it’s merged. The author might ask you to modify your PR, so you do those, get the PR accepted, and then you claim “done!”